Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2008-07-23
2011-11-22
Harper, Kevin C (Department: 2462)
Multiplex communications
Diagnostic testing
Fault detection
Reexamination Certificate
active
08064353
ABSTRACT:
The communication device has a frame transfer unit that executes frame transfer via the first communication link and the second communication link, a link confirmation frame sending unit, and a return link confirmation frame monitoring unit. The link confirmation frame sending unit causes the frame transfer processing unit to send a link confirmation frame for use in confirming a normal link status via the first communication link from the communication device to the counterpart communication device. The return link confirmation frame monitoring unit performs fault detection of the first and second communication links by monitoring a return link confirmation frame which is to be returned from the counterpart communication device to the communication device via the second communication link when the counterpart communication device receives the link confirmation frame via the first communication link.
REFERENCES:
patent: 6707820 (2004-03-01), Arndt et al.
patent: 2004/0228358 (2004-11-01), Beshai et al.
patent: 2005/0249123 (2005-11-01), Finn
patent: 2006-245849 (2006-09-01), None
M. Foshiano, Cisco Systems, Apr. 2007, “Cisco Systems UniDirectional Link Detection (UDLD) Protocol draft-foschiano-udld-03.txt”.
Akahane Shinichi
Kaganoi Teruo
Kohno Tomohiko
Sugai Kazuo
ALAXALA Networks Corporation
Brundidge & Stanger, P.C.
Harper Kevin C
LandOfFree
Communication device, communication system, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Communication device, communication system, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication device, communication system, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4277855